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Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals

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Photogeneration effects in amorphous selenium.

|January 16, 2010

Summary

The rate of photogeneration in amorphous selenium films directly correlates with the applied electric field. This study clarifies photogeneration mechanisms by separating trapping and supply limitations.

Area of Science:

Materials Science
Solid-State Physics
Photophysics

Background:

Photogeneration is crucial for understanding photoconductive materials.
Amorphous selenium is a key material in optoelectronic devices.
Electric field effects on photogeneration require detailed investigation.

Purpose of the Study:

To investigate the direct relationship between electric field and photogeneration rate in amorphous selenium.
To differentiate between bulk trapping and supply limitations affecting carrier transport.
To elucidate the wavelength and electric field dependence of photosensitivity.

Main Methods:

Time-resolved carrier transport measurements.
Fabrication of evaporated amorphous selenium films.

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Application of controlled electric fields across the film.

Main Results:

Photogeneration rate shows a direct dependence on the applied electric field.
Bulk trapping losses were successfully separated from generation region limitations.
Conventional recombination effects in the optical absorption region were eliminated.
Wavelength and electric field dependencies of photosensitivity were established.

Conclusions:

The electric field significantly influences photogeneration in amorphous selenium.
The study provides a method to isolate and analyze photogeneration processes.
Understanding these dependencies is key to optimizing photosensitive devices.